Maximizing PV hosting capacity by smart allocation of PV: A case study on a Swedish distribution grid
Detailed simulations of large amounts of PV production in Swedish rural power grids show that as module and system prices keep declining and thus increasing the profitability and demand for solar power, current grid performance will limit the potential. Simulations have been made on a case distribution grid (10 kV) with actual hourly load data for 2014 and calculated hourly production with respect to building roof area, tilt and azimuth together with irradiation data. At high production, especially voltage rises along cables in the outer part of the grid is problematic but also currents in cables close to transformer buses increases substantially at these conditions. Resulting hosting capacity for the case grid is 29 %, as of annual production compared to annual demand. Limiting the hosting capacity is the tolerated voltage rise, which is set to 5% of nominal grid voltage. Different solutions to keep power quality within acceptable levels during peak production will be simulated and evaluated, including battery banks and inverter control.